KR101346980B1 - Method and Apparatus for Compensating Dark Line of Flat Display - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a black line compensation method and apparatus for a flat panel display device which compensates for the luminance of line defects when line defects appearing on the display surface alone due to process errors.

The black line compensation method of the flat panel display includes a plurality of compensation value patterns having left / right symmetry for compensating for luminance of a black line which is located between the reference planes in one display plane and looks darker than the reference plane by analyzing a plurality of display panel samples. Preparing; Measuring luminance by supplying the same gray level data to the entire display surface of the flat panel display panel; Determining black lines located between the reference planes within a display surface of the flat panel display panel based on the luminance measurement result; Observing the change in luminance of the black line while modulating the digital video data to be displayed on the black line into the plurality of compensation value patterns, and selecting a compensation value pattern when the luminance of the reference plane and the black line are substantially the same. ; Storing the selected compensation value pattern in a memory for driving the flat panel display panel; And modulating the digital video data to be displayed on the black line by using the compensation value pattern stored in the memory to display an image on the flat panel display panel.

Description

Method and device for compensating black lines of flat panel display device {Method and Apparatus for Compensating Dark Line of Flat Display}

1 is a view showing an example of a black line.

2 is a detailed block diagram of a black line for explaining a black line compensation method of a flat panel display device according to an embodiment of the present invention.

3 is a graph showing gamma characteristics of data.

4 is a flowchart for explaining step by step a method of manufacturing a flat panel display device according to an embodiment of the present invention;

FIG. 5 is a diagram illustrating a system for analyzing black line and determining a compensation value used in the manufacturing method of FIG. 4. FIG.

6 is a view showing an example of a dither pattern applicable in the present invention.

7 is a block diagram illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

8 is a block diagram illustrating in detail the compensation circuit of FIG. 7;

DESCRIPTION OF THE RELATED ART [0002]

101: data driving circuit 102: gate driving circuit

103: liquid crystal display panel 104: timing controller

105: compensation circuit 111: FRC control unit

112: EEPROM 113: Register

114: interface circuit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display device. In particular, a flat panel display which compensates for the luminance of a line defect when a line-shaped defect (hereinafter referred to as a “line defect”) appearing on the display surface due to a process error alone appears. It relates to a black line compensation method and apparatus of the apparatus.

The flat panel display device includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP) and an organic light emitting diode display (OLED). OLED), and most of them are commercially available and commercially available.

Liquid crystal display devices can meet the trend of thin and small size of electronic products and have improved mass productivity and are rapidly replacing cathode ray tubes in many applications.

In particular, an active matrix type liquid crystal display device that drives a liquid crystal cell using a thin film transistor (hereinafter referred to as "TFT") has the advantages of excellent image quality and low power consumption, and secures the latest mass production technology. As a result of research and development, it is rapidly developing into larger size and higher resolution.

The manufacturing process of the liquid crystal display device is to produce a TFT array substrate by a semiconductor process including a photolithography process. The photolithography process will include a series of exposure, development, and etching processes. In such a photolithography process, a linear defect may appear on the finished substrate due to variation in the exposure amount. In order to lower the defective level of the display panel in which such linear defects exist, each manufacturer is currently mitigating the defective portion only by the repair process, but discards the display panel when the relaxed level does not meet the quality standard.

1 shows an example in which black line defects appear among the defects in the form of lines. The black line defect is another normal display surface where the gate-source overlapping area, the height of the spacer, the parasitic capacitance between the signal line and the pixel electrode, etc. of the TFT formed in the part shown as the black line are bright due to the exposure difference or lens aberration. Occurs when a difference occurs. When the same gray level data is applied to all the pixels of the display panel, the luminance is lower than that of the normal display surface around the black line.

Accordingly, an object of the present invention is to provide a method and an apparatus for compensating for black lines of a flat panel display device, which is intended to solve the problems caused by the prior art and to compensate for the luminance of the line defects when the line defects appear alone.

In order to achieve the above object, the black line compensation method of a flat panel display device according to an embodiment of the present invention to compensate for the brightness of the black line located between the reference plane in one display surface and darker than the reference plane by analyzing a plurality of display panel samples Providing a plurality of compensation value patterns having left / right symmetry for each other; Measuring luminance by supplying the same gray level data to the entire display surface of the flat panel display panel; Determining black lines located between the reference planes within a display surface of the flat panel display panel based on the luminance measurement result; Observing the change in luminance of the black line while modulating the digital video data to be displayed on the black line into the plurality of compensation value patterns, and selecting a compensation value pattern when the luminance of the reference plane and the black line are substantially the same. ; Storing the selected compensation value pattern in a memory for driving the flat panel display panel; And modulating the digital video data to be displayed on the black line by using the compensation value pattern stored in the memory to display an image on the flat panel display panel.

The black line includes the darkest central compensation region in the black line, and a progressive compensation region virtually divided into a plurality of sections that are disposed on the left and right sides of the central compensation region and become darker toward the central compensation region.

Each of the compensation value patterns may include a first compensation value corresponding to the center compensation area, a second compensation value corresponding to a first progressive compensation area located to the left of the central compensation area, and a right side of the central compensation area. And a third compensation value corresponding to the second gradual compensation area.

The first compensation value is higher than the second and third compensation values, and the second and third compensation values are given different values in units of the intervals, and are lower in the intervals farther from the central compensation region.

The second and third compensation values are symmetrical with respect to the central compensation area.

The second and third compensation values are equal to each other in a section spaced at the same distance from the central compensation area.

The black line compensation device of a flat panel display device according to an embodiment of the present invention includes a flat panel display panel; A memory in which a compensation value having left and right symmetry is stored; A compensator configured to receive digital video data and modulate some of the digital video data into the compensation value; And a driving unit which displays the modulated digital video data on the flat panel display panel.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 2 to 8 based on a liquid crystal display.

Before describing an embodiment of the present invention in detail, it will be defined the black line, the center compensation region, the gradual compensation region as follows.

Referring to FIG. 2, a black line is an area where luminance is lower than a reference plane when data of the same gradation is applied to the entire display surface. The black line appears vertically at an arbitrary position on the display surface due to a process error. It includes an area.

The center compensation area a corresponds to the central position of the black line in the width direction x of the black line and is the darkest visible region in the black line. Since the center compensation region a does not overlap the reference plane, it appears darkest and the highest compensation value is applied within the black line.

Gradient compensating regions (b-e, b'-e ') are overlapping center compensating regions (a) and reference planes. 'e'), the closer to the center compensation area, the closer to the luminance of the central compensation region, and the closer to the non-overlapping surface of the reference surface, the closer to the luminance of the reference surface. In other words, the progressive compensation areas b to e and b 'to e' appear darker as the central compensation area a is closer, and become more coarse toward the non-overlapping plane of the reference plane. The progressive compensation areas b to e and b 'to e' are divided into a plurality of sections. Here, the plurality of sections are defined as widths obtained by converting the widthwise lengths of the progressive compensation areas b to e and b 'to e' by the number of pixels, and dividing the converted length by a multiple of four. In the progressive compensation areas b to e and b 'to e', the compensation value is automatically determined to be gradually smaller from the section close to the center compensation area a to the section closer to the non-overlapping surface of the reference plane.

As a result of repeating the experiments with various display panels, the width and luminance of the black line may be slightly different for each display panel, but it appears darkest in the center compensation area (a) and is moved from the center compensation area (a) to the non-overlapping plane of the reference plane. Increasingly, it has been found that the basic luminance patterns converging to the luminance of the reference plane are substantially the same.

The black line compensation method of the flat panel display device according to an exemplary embodiment of the present invention includes a compensation value corresponding to the center compensation region (a) and a progressive compensation region (b to e, b 'to e') based on the basic luminance pattern of the black line. Automatically optimizes the compensation value of, and stores the selected compensation value and position data indicating the position of each pixel of the black line in the memory. The memory is a nonvolatile memory that stores compensation values and position data in the form of a look-up table, for example, EEPROM (Electrically Erasable Programmable Read Only Memory) or EDID ROM (Extended Display Identification Data ROM). In addition to the Mura compensation data, the EDID ROM stores the seller / producer identification information (ID) and variables and characteristics of the basic display element as monitor information data. This memory is added to the driving circuit of the flat panel display with an adder for adding the compensation value to the data. As a result, the black line compensation method of the flat panel display device according to an embodiment of the present invention stores the compensation value automatically determined based on the basic luminance pattern of the black line in the memory, and modulates the input data with the compensation value stored in the memory to remove the black line defect. Compensate for luminance Compensation values should be optimized for each gray level or for a plurality of gray level groups such as low gray level, middle gray level, and high gray level based on the gamma characteristics of the data as shown in FIG. On the other hand, if the compensation value is determined to be the same value in each grayscale, ignoring the gamma characteristic of the data, the luminance of the black line may be compensated at a specific grayscale, but the blackline may still be visible at the other grayscale.

In the black line compensation method of the flat panel display according to the embodiment of the present invention, as shown in Tables 1 to 3 below, the compensation values of the gradual compensation areas b to e and b 'to e' are compensated for. The symmetry is changed symmetrically with respect to the compensation area (a), and the closer to the center compensation area (a), the higher the determination is made. Compensation values for compensating the brightness of the black line may be determined by a decimal number less than an integer + 1, and the compensation value of the decimal value is referred to as frame rate control using a dither pattern (hereinafter referred to as "FRC"). ) The compensation values of Tables 1 to 3 below represent only a fraction less than 1 except for integers. The integer portion of the compensation value may be determined to satisfy the symmetry in the left / right gradual compensation areas b to e and b 'to e', based on the center compensation area a, like the decimal part. The same may be determined in a) and the progressive compensation areas b to e and b 'to e'.

In addition, the black line compensation method of the flat panel display device according to the embodiment of the present invention optimizes the compensation value of the black line for each gradation in consideration of the gamma characteristics of the data as shown in FIG. 3, and the darker the black line, the higher the compensation value is determined. do. For example, the compensation value increases from low gradation to high gradation, and the darker the black line, the higher the gradation.

e ' d ' c ' b ' a b c d e 0 to 25 0 0 0 0 0 0 0 0 0 26-50 0 0 1/8 1/8 2/8 1/8 1/8 0 0 51-80 0 1/8 1/8 2/8 3/8 2/8 1/8 1/8 0 81-110 1/8 1/8 2/8 3/8 4/8 3/8 2/8 1/8 1/8 111-140 1/8 2/8 3/8 4/8 5/8 4/8 3/8 2/8 1/8 More than 140 2/8 3/8 4/8 5/8 6/8 5/8 4/8 3/8 2/8

e ' d ' c ' b ' a b c d e 0 to 25 0 0 0 0 0 0 0 0 0 26-50 0 0 0 1/8 1/8 1/8 0 0 0 51-80 0 0 1/8 1/8 2/8 1/8 1/8 0 0 81-110 0 1/8 1/8 2/8 3/8 2/8 1/8 1/8 0 111-140 1/8 1/8 2/8 3/8 4/8 3/8 2/8 1/8 1/8 More than 140 1/8 2/8 3/8 4/8 5/8 4/8 3/8 2/8 1/8

e ' d ' c ' b ' a b c d e 0 to 25 0 0 0 One 2 One 0 0 0 26-50 0 1/8 1/8 2/8 3/8 2/8 1/8 1/8 0 51-80 1/8 1/8 2/8 3/8 4/8 3/8 2/8 1/8 1/8 81-110 1/8 2/8 3/8 4/8 5/8 4/8 3/8 2/8 1/8 111-140 2/8 3/8 4/8 5/8 6/8 5/8 4/8 3/8 2/8 More than 140 3/8 4/8 5/8 6/8 7/8 6/8 5/8 4/8 3/8

In Tables 1 to 3, the numbers in the leftmost column mean gray scale, and the symbols in the uppermost column indicate the center compensation area (a) and the progressive compensation area (b ~ e, b '~ e) of the black line. ').

The compensation values of Tables 1 to 3 have the same symmetry corresponding to the luminance pattern of the black line, and the compensation values vary according to the luminance degree of the black line. In the black line compensation method of the flat panel display device according to an embodiment of the present invention, as shown in Tables 1 to 3, a plurality of optimized compensation values are determined in advance according to the degree of brightness of the black line, and any one of them is selected as the compensation value of the black line. To modulate the digital video data to be displayed on the black line.

4 is a flowchart for explaining a method of manufacturing a flat panel display device according to an exemplary embodiment of the present invention step by step. FIG. 5 shows a system for analyzing black lines and determining a compensation value used in the manufacturing method of FIG. 4.

4 and 5, in the manufacturing method of the flat panel display device according to the exemplary embodiment of the present invention, after manufacturing the upper and lower plates, respectively, the upper and lower plates are bonded with a sealant or frit glass. (S1, S2, S3) The upper plate and the lower plate may be manufactured in various forms according to the type of the flat panel display panel 40. For example, in the case of a liquid crystal display panel, a color filter, a black matrix, a common electrode, an upper alignment layer, etc. may be formed on an upper plate, and a data line, a gate line, a TFT, a pixel electrode, a lower alignment layer, a column spacer, etc. may be formed on a lower plate. Can be. In the case of a plasma display panel, an address electrode, a lower dielectric, a partition, a phosphor, and the like may be formed on a lower plate, and an upper dielectric, an MgO passivation layer, and a sustain electrode pair may be formed on an upper plate.

Subsequently, in the inspection process of the flat panel display device, test data of each gray level is applied to the flat panel display panel 40 to display a test image, and the image is electrically inspected using the sensing device 42 as shown in FIG. The brightness and chromaticity of the entire display surface are measured by visual inspection (S4). If black lines are found on the flat panel display in the inspection process (S5), the positions where the black lines appear and the luminance of the black lines are analyzed.

Subsequently, the present invention determines the position data indicating each pixel in the bright line, and the black line actually measured in the flat panel display panel 40 among the compensation value patterns optimized according to various types of black lines as shown in Tables 1 to 3 below. The compensation value for each gradation area of the central compensation area a and the progressive compensation areas b to e and b 'to e' is selected. In the present invention, the position data indicating the position of each pixel of the black line and the selected compensation values are stored in a memory through a user connector and a ROM writer (S7, S8). The compensation value added to or subtracted from the digital video data to be displayed should be optimized for each gray level in consideration of the analog gamma characteristics of the flat panel display panel as shown in FIG. 3.

If the black line is not seen in the entire display surface in step S5, the flat panel display device is determined as good quality and shipped.

The black line analysis and compensation value determination system supplies data to the sensing device 42 and the flat panel display panel 40 for sensing the luminance and chromaticity of the flat panel 40 as shown in FIG. A computer 44 for analyzing the luminance and chromaticity of the flat panel display panel 40 from the output signal, and a memory 46 for storing the optimized compensation value determined by the computer 44 are provided.

The sensing device 42 detects the brightness and chromaticity of the test image displayed on the flat panel display panel 40 including a camera and / or an optical sensor to generate voltage or current, and then converts the voltage or current into digital sensing data. Supply to computer 44.

The computer 44 supplies the test data for each gray level to the driving circuit of the flat panel display panel, and the luminance of the test image with respect to the entire display surface of the flat panel display panel for each gray level according to the digital sensing data input from the sensing device 42. And chromaticity. The computer 44 pre-stores the compensation value patterns of the optimized black lines according to various black lines as shown in Tables 1 to 3, and automatically changes the pre-stored compensation value patterns when the black lines are detected by the flat panel display panel 40. The test data to be displayed on the black line is modulated to supply the modulated test data to the flat panel display panel 40. The computer 44 observes the change of the black line, and as a result, if the luminance of the black line and the reference plane is determined to be less than or equal to the preset threshold value, the computer 44 selects the compensation value at that time and stores it in the memory 46. Here, the threshold value is an experimentally determined value in which the luminance difference between the black line and the reference plane is not seen when viewed visually at the same gray scale.

FIG. 6 illustrates an example of a dither pattern of an FRC that expresses a fine compensation value of less than '1' among compensation values for compensating for luminance of the black line described above.

Referring to FIG. 6, the FRC of the black line compensation method according to the embodiment of the present invention has a size of 8 pixels by 8 pixels and the number of pixels to which '1' is added is set differently according to the compensation value to a fractional gray scale less than 1. 1/8 dither patterns to 8/7 dither patterns expressing corresponding compensation values are used.

The 1/8 dither pattern sets 8 pixels to which '1' is added among the 64 pixels to express a compensation value corresponding to 1/8 (= 0.125) gray scale, and the 2/8 dither pattern shows 64 pixels. 16 pixels to which '1' is added are set to express a compensation value corresponding to 2/8 (= 0.250) gray scale, and 3/8 dither pattern is 24 pixels to which '1' is added among 64 pixels. Set these to represent the compensation value corresponding to 3/8 (= 0.375) gradation. The 4/8 dither pattern sets 32 pixels to which '1' is added among 64 pixels to express a compensation value corresponding to 4/8 (= 0.500) gray scale, and the 5/8 dither pattern is 64 pixels 40 pixels to which '1' is added are set to express a compensation value corresponding to 5/8 (= 0.625) gray scale, and the 6/8 dither pattern is 48 to which '1' is added among 64 pixels. The pixels are set to represent a compensation value corresponding to 6/8 (= 0.750) gray scale. The 7/8 dither pattern expresses a compensation value corresponding to 7/8 (= 0.875) gray level by setting 56 pixels to which '1' is added among 64 pixels. Each of these dither patterns changes the positions of pixels to which '1' is added every frame period.

7 illustrates a flat panel display device according to an exemplary embodiment of the present invention. This flat panel display device will be described by taking a liquid crystal display device as an example.

Referring to FIG. 7, in the flat panel display of the present invention, the display panel 103 in which the data lines 106 and the gate lines 108 cross each other and TFTs for driving the liquid crystal cells Clc are formed at the intersection thereof. ); A compensation circuit 105 for modulating the digital video data Ri / Gi / Bi to be displayed on the black line by using a previously stored compensation value; A data driving circuit 101 for supplying modulated data Rc / Gc / Bc to the data lines 106; A gate driving circuit 102 for supplying a scan signal to the gate lines 106; And a timing controller 104 for controlling the driving circuits 101 and 102.

Liquid crystal molecules are injected into the liquid crystal display panel 103 between two substrates (a TFT substrate and a color filter substrate). The data lines 106 and the gate lines 108 formed on the TFT substrate are perpendicular to each other. The TFT formed at the intersection of the data lines 106 and the gate lines 108 receives a data voltage supplied via the data line 106 in response to a scan signal from the gate line 108. To the pixel electrode. Black matrices, color filters, and the like, which are not shown, are formed on the color filter substrate. The common electrode supplied with the common voltage Vcom is formed on a TFT substrate in an IPS (In-plain Switching) mode or a FFS (Fringe Field Switching) mode, and is formed in a twisted nematic (TN) mode, an optically compensated bent (OCB) mode, It is formed on the color filter substrate in a VA (Vertically Alignment) mode or the like. Polarizers having transmission axes perpendicular to each other are attached to the TFT substrate and the color filter substrate.

The compensation circuit 105 receives input data Ri / Gi / Bi from a system interface and adds digital video data Ri / Gi / Bi to be displayed on each pixel of the black line to a pre-stored correction value. The modulated digital video data Rc / Gc / Bc and the unmodulated data Ri / Gi / Bi to be displayed on the reference plane are output.

The timing controller 104 supplies the digital video data Rc / Gc / Bc, Ri / Gi / Bi from the compensating circuit 105 to the data driving circuit 101 in accordance with the dot clock DCLK and vertical / horizontal. Controlling the gate control signal GDC and the data driving circuit 101 for controlling the gate driving circuit 102 by using the synchronization signals Vsync and Hsync, the data enable signal DE, and the dot clock DCLK. To generate a data control signal DDC. The compensation circuit 105 and the timing controller 104 may be integrated into one chip.

The data driving circuit 101 converts the digital video data Rc / Gc / Bc, Ri / Gi / Bi supplied from the timing controller 104 into an analog gamma compensation voltage and converts the analog gamma compensation voltage into a data line as a data voltage. To the field 106.

The gate driving circuit 102 sequentially supplies a scan signal to the gate lines 108 to select a horizontal line to which a data voltage is supplied.

8 shows the compensation circuit 105 in detail.

Referring to FIG. 8, a compensation circuit 105 according to an embodiment of the present invention includes an FRC control unit 111, an EEPROM 112, a register 113, and an interface circuit 114.

The FRC control unit 111 determines the display position of the digital video data Ri, Bi, and Gi according to the vertical and horizontal synchronization signals Vsync and Hsync, the data enable signal DE, and the dot clock DCLK. The position determination result is compared with the position information PD from the EEPROM 112 to detect digital video data Ri / Bi / Gi to be displayed on the black line. The FRC control unit 111 supplies the digital video data Ri, Bi, and Gi to be displayed on the black line as a read address to the EEPROM 112, and the compensation value output from the EEPROM 112 in response to the read address ( CD) is added to the digital video data Ri / Bi / Gi to be displayed on the black line. Here, the FRC control unit 111 distributes the compensation value temporally and spatially according to the predetermined dither pattern as shown in FIG. 6 and adds a compensation value of less than 1 gray scale to the digital video data Ri / Bi / Gi in the dither pattern unit. An integer compensation value of one or more gray levels is added to the digital video data in units of pixels.

The EEPROM 112 is a memory that stores the compensation value CD and the position data PD of the black line automatically selected in the manufacturing process of FIGS. 4 and 5 in the form of a lookup table. The position data PD and the compensation value CD stored in the EEPROM 112 may be updated by an electrical signal applied from the external computer 44 through the interface circuit 114.

The interface circuit 114 is configured for communication between the compensation circuit 105 and an external system, and the interface circuit 114 is designed in accordance with a communication standard protocol standard such as I ² C. The position data and the compensation value (CD) stored in the EEPROM 112 are required to be updated for reasons such as process change and difference between the applied models, and the user needs to update the user position data (UPD) and the user compensation value (UCD). Is entered via an external system. The computer 44 may read or modify data stored in the EEPROM 112 through the interface circuit 114 when such a request is made.

The register 113 temporarily stores user data UPD and CD transmitted through the interface circuit 114 to update the position data PD and the compensation data CD stored in the EEPROM 112.

Such a liquid crystal display device can be applied to other flat panel display devices without significant change. For example, the liquid crystal display panel 103 may be replaced by a field emission display device, a plasma display panel, an organic light emitting diode display device, or the like.

As described above, the black line compensation method and apparatus of the flat panel display according to the present invention provide symmetrical compensation value patterns based on the symmetrical luminance pattern of the line defect when the line defect appears alone, and the luminance and size of the black line. Accordingly, one of a plurality of compensation value patterns is automatically selected. In addition, the black line compensation method and apparatus of the flat panel display according to the present invention can compensate for the luminance of the black line, which is difficult to compensate for the luminance by modulating the digital video data to be displayed on the black line using the selected compensation value pattern.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims (10)

Preparing a plurality of compensation value patterns having left / right symmetry for compensating for luminance of a black line across a display surface and appearing darker than the reference surface by analyzing a plurality of display panel samples; Measuring luminance by supplying the same gray level data to the entire display surface of the flat panel display panel; Determining black lines located between the reference planes within a display surface of the flat panel display panel based on the luminance measurement result; Observing the change in luminance of the black line while modulating the digital video data to be displayed on the black line into the plurality of compensation value patterns, and selecting a compensation value pattern when the luminance of the reference plane and the black line are the same; Storing the selected compensation value pattern in a memory for driving the flat panel display panel; And Modulating digital video data to be displayed on the black line using a compensation value pattern stored in the memory to display an image on the flat panel display panel; Modulating the digital video data to be displayed on the black line, By distributing the compensation value according to a predetermined dither pattern supplied from the memory in temporally and spatially, a compensation value of less than 1 gray scale is added to the digital video data in units of dither patterns, A black line compensation method for a flat panel display device, comprising adding an integer compensation value of at least one gray level to digital video data in units of pixels. The method of claim 1, The black line includes a darkest central compensation region in the black line and a progressive compensation region disposed on left and right sides of the central compensation region and virtually divided into a plurality of sections that are darker toward the central compensation region; Each of the compensation value patterns may include a first compensation value corresponding to the center compensation area, a second compensation value corresponding to a first progressive compensation area located to the left of the central compensation area, and a right side of the central compensation area. And a third compensation value corresponding to the second gradual compensation area. The method of claim 2, The first compensation value is higher than the second and third compensation values, And the second and third compensation values are given different values in units of the sections, and lower as the sections are farther from the center compensation region. The method of claim 3, wherein And the second and third compensation values are symmetrical with respect to the center compensation area. The method of claim 3, wherein And the second and third compensation values are equal to each other in a section spaced apart from the central compensation area by the same distance. Flat panel display panel; A memory storing a compensation value intersecting the flat panel display panel and having a left-right symmetry for compensating for luminance of a black line appearing darker than the reference plane; A compensator configured to receive digital video data and modulate some of the digital video data into the compensation value; And A driver configured to display the modulated digital video data on the flat panel display panel; The compensation unit, A frame rate control controller, The frame rate control control unit, Determine a display position of the digital video data, compare the result with the position information from the memory, detect digital video data to be displayed in the compensation area, and supply the digital video data to the memory; By distributing the compensation value according to a predetermined dither pattern supplied from the memory in temporally and spatially, a compensation value of less than 1 gray scale is added to the digital video data in units of dither patterns, A black line compensation device for a flat panel display device, characterized by adding an integer compensation value of at least one gray level to digital video data in units of pixels. delete The method of claim 6, The compensation unit, Using the frame rate control method to distribute the compensation value temporally and spatially, And the distributed compensation value is added to the digital video data. The method of claim 6, The driving unit includes: A data driver for converting the digital video data from the compensator into analog data and supplying the analog data to the data lines of the flat panel display panel; A scan driver supplying scan pulses to scan lines crossing the data lines of the flat panel display panel; And And a timing controller for supplying digital video data from the compensator to the data driver and controlling timing of operation of the data driver and the scan driver. delete

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